Vaillant VRT 350 User manual

For the operator
Operating instructions
VRT 350
Room temperature-controlled controller
GB, IE
Operating instructions

Legal information
Document type: Operating instructions
Product: VRT 350
Target group: Operator
Language: EN
Document number_version: 0020135485_00
Created on: 06.02.2012
Publisher/manufacturer
Vaillant GmbH
Berghauser Str. 40 D-42859 Remscheid
Telefon [phone]‑0 Telefax [phone]‑28 10
[email protected] www.vaillant.de
© Vaillant GmbH 2012
These instructions, or extracts thereof, may only be printed with the written consent of Vaillant GmbH.
All designations of products in these instructions are brand names/trade marks of the companies in ques-
tion.
We reserve the right to make technical changes.

Contents
0020135485_00 VRT 350 Operating instructions 3
Contents
1 Notes on the documentation.............................. 5
1.1 Symbols and signs used.............................................. 5
1.1.1 Symbols........................................................................... 5
1.2 Structure of warnings.................................................. 5
1.3 Observe other applicable documents...................... 5
1.4 Document storage........................................................ 5
1.5 Applicability of the instructions................................ 5
2 Safety.................................................................... 6
2.1 Action-related warnings.............................................. 6
2.2 Required personnel qualifications............................ 6
2.2.1 Operator.......................................................................... 6
2.3 General safety information ........................................ 6
2.3.1 Installation only by a skilled tradesman.................. 6
2.3.2 Risk of scalding as a result of hot drinking
water................................................................................ 6
2.3.3 Danger caused by a malfunction .............................. 6
2.3.4 Frost damage caused by switching the unit off.... 6
2.3.5 Frost damage caused by excessively low room
temperature .................................................................. 6
2.4 CE label............................................................................ 7
2.5 Intended use .................................................................. 7
3 Overview of the equipment................................. 8
3.1 Product features........................................................... 8
3.2 Type designation and serial number........................ 8
3.2.1 Type designation........................................................... 8
3.2.2 Identification plate ....................................................... 8
3.2.3 Serial number ................................................................ 8
3.3 Unit design...................................................................... 8
3.4 Control function ............................................................ 8
3.4.1 Heating installation ...................................................... 8
3.4.2 Hot water generation................................................... 9
3.4.3 ’VR 66’ Control Centre............................................... 9
3.5 Frost protection function............................................ 9
4 Operating ............................................................. 10
4.1 Operating structure .................................................... 10
4.1.1 Access level for the operator ................................... 10
4.1.2 Access level for the skilled tradesman................... 10
4.1.3 Menu structure design................................................ 10
4.1.4 Basic display.................................................................. 10
4.1.5 Selection level ............................................................... 11
4.1.6 Setting level ................................................................... 11
4.2 Operating concept........................................................ 11
4.2.1 Operation in the basic display .................................. 12
4.2.2 Operating example: Changing the date.................. 12
4.3 Overview of the menu structure.............................. 14
4.4 Overview of setting and read-out options............. 16
4.4.1 Using the overview in table format......................... 16
4.4.2 Entering your own settings ....................................... 16
4.4.3 Overview of operating modes .................................. 17
4.4.4 Overview of operating levels .................................... 17
5 Operating and display functions ....................... 19
5.1 Information.................................................................... 19
5.2 Settings .......................................................................... 19
5.2.1 Setting desired temperatures .................................. 19
5.2.2 Setting timer programs............................................ 20
5.2.3 Days away from home scheduling.......................... 22
5.2.4 Language selection .................................................... 22
5.2.5 Setting the date .......................................................... 22
5.2.6 Setting the time .......................................................... 22
5.2.7 Changing over to daylight saving time.................. 23
5.2.8 Setting the display contrast..................................... 23
5.2.9 Setting the offset room temperature.................... 23
5.2.10 Changing heating circuit naming............................ 23
5.2.11 Resetting to factory setting..................................... 23
5.2.12 Installer level................................................................ 23
5.3 Operating modes ........................................................ 23
5.3.1 Operating modes for the heating circuit .............. 24
5.3.2 Modes for hot water production ............................. 24
5.4 Special operating modes .......................................... 25
5.4.1 Cylinder boost.............................................................. 25
5.4.2 Party .............................................................................. 25
5.4.3 1 day away from home............................................... 25

Contents
4Operating instructions VRT 350 0020135485_00
5.5 Messages ...................................................................... 25
5.5.1 Service message ......................................................... 25
5.5.2 Fault message.............................................................. 25
6 Saving energy..................................................... 27
6.1 Controlling the room temperature......................... 27
6.2 Reducing the room temperature ............................ 27
6.3 Uniform heating .......................................................... 27
6.4 Using thermostatic radiator valves and
weather compensators or room thermostats ..... 27
6.5 Do not cover controllers ........................................... 27
6.6 Ensuring economic hot water generation ............ 27
7 Service and troubleshooting............................ 28
7.1 Cleaning the controller............................................. 28
7.2 Detecting and rectifying faults............................... 28
8 Decommissioning ............................................... 29
8.1 Replacing the controller............................................ 29
8.2 Recycling and disposal .............................................. 29
9 Warranty and customer service....................... 30
9.1 Warranty ...................................................................... 30
9.2 Customer service....................................................... 30
10 Technical data ..................................................... 31
10.1 Controller....................................................................... 31
11 Glossary .............................................................. 32
11.1 Selection level ............................................................. 32
11.2 Mode .............................................................................. 32
11.3 Setting level ................................................................. 32
11.4 Fault message.............................................................. 32
11.5 Heating circuit ............................................................. 32
11.6 Heating installation .................................................... 32
11.7 Night temperature...................................................... 32
11.8 Room temperature..................................................... 32
11.9 Day temperature......................................................... 32
11.10 Level of protection..................................................... 32
11.11 Protection class........................................................... 32
11.12 Status message........................................................... 32
11.13 Thermostatic radiator valve .................................... 32
11.14 Flow temperature ....................................................... 32
11.15 Hot water generation................................................. 32
11.16 Time periods ................................................................ 33
11.17 Timer program ............................................................ 33
11.18 Access level for the operator .................................. 33
11.19 Access level for the competent person................. 33
Index....................................................................................34

Notes on the documentation 1
0020135485_00 VRT 350 Operating instructions 5
1 Notes on the documentation
1.1 Symbols and signs used
1.1.1 Symbols
The following symbols may appear:
Warning symbol (→Page 6)
Information symbol

Symbol for a required action.
Symbol for the result of an action.
Symbol for the completion of records and check-
lists
Symbol for a required qualification
Symbol for a required tool
Symbol for the specification of a technical value
1.2 Structure of warnings
Warning signs are identified by an upper and lower separ-
ating line and are laid out according to the following basic
principle:
Danger!
Type and source of danger
Explanation of the type of danger.
▶Measures for averting the danger.
1.3 Observe other applicable documents
▶When operating the controller, always take note of all
operating instructions that are supplied with the other
components of the heating system.
1.4 Document storage
Keep these operating instructions and all other applicable
documents safe so that
–they are available whenever required,
–they are kept for the full service life of the unit,
–they are available to all subsequent operators.
1.5 Applicability of the instructions
These operating instructions apply to appliances with the
following article numbers only:
Article number
Great Britain 0020124475
Table 1.1: Article number

2 Safety
6Operating instructions VRT 350 0020135485_00
2 Safety
2.1 Action-related warnings
Classification of action-related warnings
The action-related warnings are classified in accordance
with the severity of the possible danger using the following
warning symbols and signal words:
Warning symbols and signal words
Danger!
Imminent danger to life or risk of severe per-
sonal injury
Danger!
Risk of death from electric shock
Warning!
Risk of minor personal injury
Caution!
Risk of material or environmental damage
2.2 Required personnel qualifications
These instructions are aimed at those who are able to oper-
ate a heating installation but do not have any special tech-
nical knowledge or experience.
2.2.1 Operator
Definition:
Instructed
operator
The operator is charged with operation and
maintenance of the unit. He/she must ensure
compliance with maintenance intervals. He/she
does not require any special technical know-
ledge or experience.
The operator must have been instructed in
the following topics by the authorised skilled
tradesman.
–General safety information
–Function and location of safety devices on
the system
–Operation of the unit
–Energy-saving operation
–Maintenance operations
2.3 General safety information
2.3.1 Installation only by a skilled tradesman
Installation of the unit can be only carried out by an ap-
proved, skilled tradesman. This skilled tradesman is also
responsible for proper installation and start-up.
2.3.2 Risk of scalding as a result of hot drinking
water
There is a risk of scalding at the hot water draw-off points
if the set target temperature is greater than 60 °C. Young
children and elderly persons are particularly at risk, even at
lower temperatures.
▶Select a moderate target temperature.
2.3.3 Danger caused by a malfunction
▶Ensure that air can circulate freely around the controller,
and that the controller is not covered by furniture, cur-
tains or other objects.
▶Ensure that all radiator valves in the room where the
controller is fitted are fully open.
▶Only operate the heating installation when it is in a tech-
nically perfect condition.
▶Ensure that any faults and damage that may negatively
affect safety are rectified immediately.
2.3.4 Frost damage caused by switching the unit
off
If you switch off the heating installation, parts of the heat-
ing installation may be damaged by frost.
▶Do not disconnect the heater from the power mains.
▶Leave the heating installation main switch in the "1" posi-
tion.
2.3.5 Frost damage caused by excessively low
room temperature
If the room temperature is set too low in individual rooms,
sections of the heating installation might be damaged by
frost.
▶If you are absent during a frosty spell, ensure that the
heating installation remains in operation and the rooms
are warmed adequately.
▶Please note the frost protection function.

Safety 2
0020135485_00 VRT 350 Operating instructions 7
2.4 CE label
The CE label documents that the controller com-
plies with the fundamental requirements of the relevant
directives.
2.5 Intended use
State-of-the-art
The controller is a state-of-the-art unit manufactured in
accordance with recognised safety regulations.
Even so, in the event of inappropriate or non-intended use,
impairment of the unit and other property may arise.
The controller controls a heating installation with a Vaillant
heater with eBUS interface in a way that is room-controlled
and time-dependent.
The controller can control the hot water generation of a
connected domestic hot water cylinder.
Improper use
Any other use, or use beyond that specified, shall be
considered improper use. Any direct commercial or
industrial use is also deemed to be improper. The manufac-
turer/supplier is not liable for any resulting damage. The
user alone bears the risk.
Improper use of any kind is prohibited.
Other applicable documents
Intended use includes:
–observing the included operating, installation and servi-
cing instructions for the Vaillant product and any other
parts and components of the system
–compliance with all inspection and servicing conditions
listed in the instructions.

3 Overview of the equipment
8Operating instructions VRT 350 0020135485_00
3 Overview of the equipment
3.1 Product features
–Room-temperature-controlled
–Controls heater and hot water
–Plain text display
–Illuminated display
3.2 Type designation and serial number
3.2.1 Type designation
Abbreviation Explanation
’VRT’ Vaillant controller
3xx Room temperature controlled
Table 3.1: Type designation
3.2.2 Identification plate
The identification plate is located inside the controller and
is not accessible from the outside.
3.2.3 Serial number
The 10-digit article number can be found in the serial num-
ber. You can view the serial number under "Menu →Inform-
ation →Serial number". The article number is found in the
second line of the serial number.
3.3 Unit design
1
2
4
3
5
Image 3.1: Controller (front view)
1 Display
2 Diagnosis socket
3 Right selector button
4 Control knob
5 Left selector button
3.4 Control function
The controller controls the Vaillant heating system and
hot water generation of a connected domestic hot water
cylinder.
3.4.1 Heating installation
The controller is a room-temperature-controlled controller
and must be installed in the living room.
You can use the controller to set the desired temperature
for different times of the day and for different days of the
week.
The temperature sensor measures the room temperature
and sends the values to the controller. At lower room tem-
peratures, the controller switches the heater on. Once the
room temperature reaches the desired set temperature,
the controller switches the heater off. The controller there-
fore reacts to the fluctuations of the room temperature and
constantly controls the room temperature to the temperat-
ure that you have set.

Overview of the equipment 3
0020135485_00 VRT 350 Operating instructions 9
3.4.2 Hot water generation
You can use the controller to set the temperature and time
for the hot water generation. The heater heats the water in
the domestic hot water cylinder until it reaches the set tem-
perature. You can set a time period during which hot water
should be available in the domestic hot water cylinder.
3.4.3 ’VR 66’ Control Centre
If a ’VR 66’ Control Centre is connected, you can control
two independent heating circuits with just one ’VRT 350’
controller; e.g. one heating circuit is in the single-occupancy
house and the second heating circuit is in a guest apart-
ment in this building. In this case, one controller is always
the main controller (Zone 1) and the other controller is the
auxiliary controller (Zone 2). For Zone 1, which is controlled
via the main controller, all of the functions are available to
you. For Zone 2, you can use the auxiliary controller to set
the desired temperature for different times of the day and
different days of the week.
3.5 Frost protection function
The frost protection function protects the heating system
and apartment from frost damage.
The frost protection function monitors the room temperat-
ure. If the room temperature
–falls below 5 °C, the controller switches the heater on
and controls the system to a target room temperature of
5 °C.
–exceeds 5 °C, the heater is switched off but the room
temperature monitoring remains active.

4 Operating
10 Operating instructions VRT 350 0020135485_00
4 Operating
4.1 Operating structure
The controller has two superordinate operating levels.
4.1.1 Access level for the operator
Through the access level for the operator, you access im-
portant information and set-up options which do not re-
quire any special prior knowledge. Via a menu structure,
you can access configurable or read-only values.
4.1.2 Access level for the skilled tradesman
The skilled tradesman will set further values for the heating
installation via the access level for the skilled tradesman.
The settings may only be made by someone with specialist
knowledge; this level is therefore code-protected.
4.1.3 Menu structure design
The menu structure of the controller is split into three
levels. There are two selection levels and one setting level.
From the basic display, you can access selection level 1 and,
from there, you can access the menu structure for one level
up or down. The setting level is accessed from the lowest
selection level.
4.1.4 Basic display
Auto 01.07.11
°C
19,5
15:34
Desired temperature 20,0°C
Menu Mode
1
2
3
4
8
7
5
6
Image 4.1: Basic display
1 Date
2 Current room temperat-
ure
3 Time
4 Current function of the
right-hand selector button
(soft key function)
5 Current function of the
left-hand selector button
(soft key function)
6 Desired temperature
7 Symbol for heating mode
in «Auto» mode
8 Mode set for the heating
mode
The basic display is the permanently visible display on the
screen. The basic display shows the current settings and
values of the heating installation. If you make a setting on
the controller, the display on the screen switches from the
basic display to the display for the new setting.
The basic display appears when you:
–press the left-hand selection button and thus exit selec-
tion level 1.
–do not operate the controller for more than 5 minutes.
4.1.4.1 Symbols for the heating mode in the
«Auto» operating mode
Symbol Meaning
Heating mode within a set time period (comfort
mode)
Heating mode outside a set time period (set-back
mode)
Table 4.1: Symbols for heating mode
4.1.4.2 Soft key function
Both selector buttons have a soft key function. The current
functions of the selector buttons are displayed in the bot-
tom display line. Depending on the selection level selected
in the menu structure, the list entry or the value,
–the current function of the left-hand selection button
may differ.
–the current function of the right-hand selector button
may differ.
If, for example, you press the left function key, the current
function of the left function key switches from «Menu» to
«Back».
4.1.4.3 Menu
If you press the left-hand selector button, «Menu», you
switch from the basic display to selection level 1 of the
menu structure.
4.1.4.4 Mode
If you press the right-hand selector button, «Operating
mode», you access the settings under «Operating mode»
directly from the basic display. This is a quick way to modify
the of «HEATING 1».

Operating 4
0020135485_00 VRT 350 Operating instructions 11
4.1.4.5 Desired temperature
Depending on the operating mode, the desired temperature
may be greyed out on the basic display. This is the case, for
example, in «Summer mode». As heating is not operational
in «Summer mode», and therefore the heating circuit is off,
there is no desired temperature.
4.1.5 Selection level
Menu
Information
Desired temperatures
Time programmes
Back Select
1
4
3
2
Image 4.2: Display fields in the selection levels
1 Scroll bar (only appears if
there are more list entries
than can be shown at
once on the display)
2 Current functions of
the right and left-hand
selector buttons (soft key
functions)
3 Selection level list entries
4 Current function or selec-
tion level
Through the selection levels, you navigate to the setting
level in which you wish to read or change settings.
4.1.6 Setting level
HEATING 1
Day
Night set-back
Back Change
20,0°C
15,0°C
1
3
2
5
4
Image 4.3: Display fields in the setting level
1 Current selection level
2 Values
3 Highlighting (white font
on black background)
shows the current selec-
tion.
4 Current functions of
the right and left-hand
selector buttons (soft key
functions)
5 Setting level
In the setting level, you can select the values you wish to
read or change.
4.2 Operating concept
The controller is operated using two selector buttons and a
rotary knob (→Page 8).
You can use the selector buttons to
–navigate through the selection levels and the setting
level in the menu structure,
–select a setting,
–confirm a value,
–activate an operating mode,
–cancel a change to a value.
You can use the rotary knob to
–navigate through the list entries of a selection level by
turning the rotary knob to the left or right
–highlight a selection level or a setting level,
–change a selected value.
The display shows a highlighted selection level, a setting
level or a highlighted value with white font on a black back-
ground. A flashing highlighted value means that you can
change the value.
Note
If you do not operate the controller during
a period of more than 5 minutes, the basic
display appears in the display again.

4 Operating
12 Operating instructions VRT 350 0020135485_00
4.2.1 Operation in the basic display
From the basic display, you can change the «Desired day
temperature» directly for the current day by turning the
rotary knob.
Desired day temperature
Only today: 18°C
For Permanent Change
Press OK
OK
4.4: Requesting a permanent change of the desired temperature
In the display, a request appears asking if you wish to
change the «Desired day temperature» for the current day
or on a permanent basis.
4.2.1.1 To change the «Desired day temperature»
for the current day only
▶Turn the rotary knob to set the desired temperature.
◁The display switches back to the basic display after
12 seconds. The set desired temperature applies only
until the end of the active time period of the current
day.
4.2.1.2 To change the «Desired day temperature»
permanently
1. Turn the rotary knob to set the desired temperature.
2. Press the right-hand selector button, «OK».
◁The display switches to the basic display. The new
desired day temperature is applied permanently.
4.2.2 Operating example: Changing the date
Auto 01.07.11
°C
19,5
15:34
Desired temperature 20,0°C
Menu Mode
Image 4.5: Basic display
1. If the display does not show the basic display, press the
left-hand selector button, «Back», until the basic display
appears again.
2. Press the left-hand selector button, «Menu».
◁The controller is now in selection level 1. The left-
hand selector button now has the function «Back»
(to the next selection level up), the right-hand se-
lector button has the function «Select» (the next se-
lection level down).
Menu
Information
Desired temperatures
Time programmes
Back Select
Image 4.6: Selection level 1: «Information»
3. Turn the rotary knob until the «Basic settings» list
entry is highlighted.
Menu
Time programmes
Time programmes
Days away scheduling
Basic settings
Back
Select
Image 4.7: Selection level 1: «Basic settings»
4. Press the right-hand selector button, «Select».
◁The controller is now in selection level 2.
Basic settings
Language
Date / Time
Display
Back Select
Image 4.8: Selection level 2: «Language»
5. Turn the rotary knob until the «Date/Time» list entry is
highlighted.

Operating 4
0020135485_00 VRT 350 Operating instructions 13
Basic settings
LanguageLanguage
Date / TimeDate / Time
Display
Back Select
Image 4.9: Selection level 2: «Date/Time»
6. Press the right-hand selector button, «Select».
◁The controller is now in the «Date» setting level. The
value for the day is highlighted. The left-hand se-
lector button now has the function «Back» (to the
next selection level up), the right-hand selector but-
ton has the function «Change» (the value).
Date / Time
Time
Date
Daylight saving
:1508
13.03.11
Off
Back Change
Image 4.10: Setting level: Value for day is highlighted
7. Press the right-hand selector button, «Change».
◁The highlighted value starts to flash; you can now
change the value by turning the rotary knob.
◁The left-hand selector button now has the function
«Cancel» (the change), the right-hand selector but-
ton has the function «OK» (to confirm the change).
Date / Time
Time
Date
Daylight saving
:1508
13.03.11
Off
Cancel OK
Image 4.11: Setting level: Accept the changed value
8. Turn the control knob to change the value.
Date / Time
Time
Date
Daylight saving
:1508
14.03.11
Off
Cancel OK
Image 4.12: Setting level: Change has been saved
9. Press the right-hand selector button, «OK», to confirm
the change.
◁The controller has stored the modified date.
Date / Time
Time
Date
Daylight saving
:1508
14.03.11
Off
Back Change
Image 4.13: Setting level: One level back
10. If the highlighted value that is flashing is correct, press
the right-hand selector button «ok» again.
◁The left-hand selector button now has the function
«Back».
11. Press the left-hand selector button, «Back» several
times to switch back to the next selection level up and
to access the basic display from selection level 1.

4 Operating
14 Operating instructions VRT 350 0020135485_00
4.3 Overview of the menu structure
Second heating circuit
If a second heating circuit is available, you can also use the main controller for Zone 1 to access the functions shown in
grey. The display of the auxiliary controller for Zone 2 does not show the functions that are shown here in grey.
Menu
Information
Desired temperatures
Time programmes
Back Select
Auto 01.07.11
°C
19,5
15:34
Desired temperature 20,0°C
Menu Mode
Menu
Information
Desired temperatures
Time programmes
Back Select
Desired temperatures
HEATING 1HEATING 1
Domestic hot waterDomestic hot water
Back Select
HEATING 1
Day
Night set-back
Back Change
Information
System status
Contact detailsContact details
Serial number
Back Select
System
Status
Water pressure
Dom. hot water
OK
2,3bar
20,0°C
43°C
15,0°C
Charging
Back
Information
System status
Contact detailsContact details
Serial numberSerial number
Back Select
Information
System status
Contact details
Serial number
Back Select
Desired temperatures
HEATING 1HEATING 1
Domestic hot waterDomestic hot water
Back Select
Domestic hot water
Dom. hot waterDom. hot water
Cancel OK
HEATING 1
HEATING 1 ----------------------------------
Day temperature
Night temp
20,0°C
15,0°C
Back
HEATING 1
Auto day temp to 22:10
away fromaway from
away to
24.12.1124.12.11
26.12.11
Back
Menu
Information
Desired temperatures
Time programmes
Back Select
Monday
Period 1:
Period 2:
Period 3:
06 : 00 - 22 : 00
_ _ : _ _ - _ _ : _ _
_ _ : _ _ - _ _ : _ _
Back Select
Monday
Period 1:
Period 2:
Period 3:
05 : 30 - 22 : 00
_ _ : _ _ - _ _ : _ _
_ _ : _ _ - _ _ : _ _
Back Select
Time programmes
HEATING 1HEATING 1
Domestic hot waterDomestic hot water
Back Select
Time programmes
HEATING 1HEATING 1
Domestic hot waterDomestic hot water
Back Select
Contact details
InstallerInstaller
PhonePhone
Back
Serial number
123456
7890123456
7890123456
Back
VRT350
4.14: Menu structure part 1

Operating 4
0020135485_00 VRT 350 Operating instructions 15
Display
Display contrast 11
Back Change
Offset
Offset room temp 0,0K0,0K
Back Change
Factory reset?
Everything
Back Select
Language
English
Back OK
Date / Time
Time
Date
Daylight saving
15: 3415: 34
29. 07. 1129
Off
Back Change
Menu
Days away scheduling
Basic settings
Back Select
Days away scheduling
Start
End
Temperature
Back Change
10.09. 11
15,0°C
01.09. 1101
Menu
Days away schedulingDays away scheduling
Basic settings
Back Select
Basic settings
Language
Date / TimeDate / Time
Display
Back Select
Basic settings
Language
Date / TimeDate / Time
Display
Back Select
Basic settings
Language
Date / TimeDate / Time
Display
Back Select
Basic settings
Offset
Change heating circuit name
Back Select
Basic settings
Offset
Factory reset
Back Select
Time programme
No
No
Menu
Basic settings
Installer level
-------------------------------------------------
Back Select
Enter code
000
Back OK
Change names
Heating 1 HEATING 1HEATING 1
Back Change
Basic settings
Change heating circuit name
Factory reset
Back Select
Factory reset
Offset
Change heating circuit name
Installer level
Installer level
4.15: Menu structure part 2

4 Operating
16 Operating instructions VRT 350 0020135485_00
4.4 Overview of setting and read-out options
4.4.1 Using the overview in table format
You will find below an overview of the setting and read-out
options.
–If the "Increment/Select" column is blank, these are val-
ues that you can read but not adjust.
–If a value cannot be set at the factory, for example be-
cause it is currently being measured, the "Factory reset"
column will be blank.
–If nothing is entered in the "Selection level 2" column,
you will be taken from "Selection level 1" directly to the
"Setting level".
4.4.2 Entering your own settings
▶In the last column, "Own setting", enter the values that
have been set by you.

Operating 4
0020135485_00 VRT 350 Operating instructions 17
4.4.3 Overview of operating modes
The activated operating mode is shown in the top left of the basic display.
The right-hand selector button can be used to navigate from the basic display directly to the settings under «Operating
mode».
If you have activated an advanced function, the display indicates the advanced function.
’VR 66’ Control Centre
If there is a second heating circuit, you can only set the operating modes using the main controller. The operating mode
that is set applies for Zone 1 and for Zone 2.
Mode Setting Factory reset Own setting
Current mode
Auto Automatic mode Active
Summer Summer mode Not active
Day Comfort mode Not active
Set-back Set-back mode Not active
System OFF System OFF Not active
Special operating mode
Cylinder boost Active, Not active Not active
Party function Active, Not active Not active
1 day away from home Active, Not active Not active
Table 4.2: Operating modes
4.4.4 Overview of operating levels
Selection
level 1
Selection
level 2
Setting level Values Unit Incre-
ment/Select
Factory reset Own
setting
min. max.
Information System
status
System
Status Current value
Water pressure Current value bar
Hot water Current value Charged, char-
ging
HEATING 1
Day temperature Current value °C 0.5 20
5 30
Set-back tem-
perature
Current value °C 0.5 15
5 30
Auto day temp
until
Current value hr:min
away from Current value dd.mm.yy
away to Current value dd.mm.yy
Contact
details
Installer Phone Current values
Serial num-
ber
Unit number Permanent value
If the ’VR 66’ is connected, the functions shown in italics are only available for Zone 1 and these are only shown in the display for the
main controller.

4 Operating
18 Operating instructions VRT 350 0020135485_00
Selection
level 1
Selection
level 2
Setting level Values Unit Incre-
ment/Select
Factory reset Own
setting
min. max.
Desired tem-
peratures
HEATING 1 Day
Set-back
5 30 °C 0.5 20
15
Hot water
circuit
Hot water 35 70 °C 1 60
Timer pro-
grams
HEATING
1
Individual days
and blocks
Mon, Tue, Wed,
Thu, Fri, Sat, Sun
and Mon - Fri, Sat
- Sun, Mon - Sun
Mon - Fri:
06:00-22:00
Sat: 07:30-
23:30
Sun: 07:30-
22:00
Time period 1:
Start - End
Time period 2:
Start - End
Time period 3:
Start - End
00:00 24:00 hr:min 10 min
Hot water
circuit
Individual days
and blocks
Mon, Tue, Wed,
Thu, Fri, Sat, Sun
and Mon - Fri,
Sat - Sun, Mon -
Sun
Mon to Fri:
05:30-22:00
Sat: 07:00-
23:30
Sun: 07:00-
22:00
Time period 1:
Start - End
Time period 2:
Start - End
Time period 3:
Start - End
00:00 24:00 hr:min 10 min
Days away
from home
scheduling
Start 01.01.00 31.12.99 dd.mm.yy Day.Month.Year 01.01.10
End 01.01.00 31.12.99 dd.mm.yy Day.Month.Year 01.01.10
Temperature Frost
protection
or 5
30 °C 0.5 Frost protection
Basic settings Language Selectable lan-
guage
English
Date/Time Date 01.01.00 31.12.99 dd.mm.yy Day.Month.Year 01.01.10
Time 00:00 24:00 hr:min 10 min 00:00
Daylight saving
time
Off, Auto Off
Display Display contrast 01 15 1 8
Offset Room temperat-
ure
-3.0 3.0 K 0.5 0.0
Setting
heating cir-
cuit names
HEATING 1 1 10 Let-
ter/number
A to Z, 0 to 9,
space
HEATING 1
Default
setting
(reset)
Timer programs Yes, no No
Everything Yes, no No
Installer level Enter code 000 999 1 000
If the ’VR 66’ is connected, the functions shown in italics are only available for Zone 1 and these are only shown in the display for the
main controller.
Table 4.3: Overview of operating levels

Operating and display functions 5
0020135485_00 VRT 350 Operating instructions 19
5 Operating and display functions
The controller offers various functions, operating modes
and advanced functions for controlling the heating installa-
tion.
–With the functions, you can read information, and set
desired temperatures, periods and basic settings.
–With the operating modes, you select whether the
heating installation should be operated in automatic or
manual mode.
–With the advanced functions, you can change the active
operating mode for the heating circuit and hot water
generation in special situations quickly and with time
restrictions.
5.1 Information
You can set the functions using the left-hand selector but-
ton: «Menu».
Select the «Information» list entry in selection level 1 to
reach selection level 2 with the «System status», «Contact
details» and «Serial number» list entries.
The path details given at the start of each function descrip-
tion indicate how you reach this function in the menu struc-
ture.
The table "Overview of operating levels" and the overview
of the menu tree show you which functions are available for
Zone 2 via the auxiliary controller.
5.2 Settings
5.2.1 Setting desired temperatures
This function is used to set the desired temperatures for
«HEATING 1» and hot water generation.
5.2.1.1 Heating circuit
Caution!
Risk of damage due to frost.
If rooms are not adequately heated, this
may cause damage to the building and to
the heating installation.
▶If you are absent during a frosty spell,
ensure that the heating installation re-
mains in operation and provides ad-
equate frost protection.
«Menu» →«Desired temperatures» →«HEATING 1»
–You can set two different desired temperatures for the
heating circuit.
–The desired «day temperature» is the temperature you
wish to have in the rooms during the day or when you
are at home (Comfort mode).
–The desired «night temperature» is the temperature that
you wish to have in the rooms during the night or when
you are away from home (Set-back mode).
5.2.1.2 Hot water generation
Danger!
Risk of being scalded by hot water.
There is a danger of scalding at the hot
water draw-off points if the temperatures
are greater than 60 °C. Young children
and elderly persons are particularly at risk,
even at lower temperatures.
▶Select the temperature so that nobody is
at risk.
«Menu» →«Desired temperatures» →«Domestic hot wa-
ter»
–You can only use the controller's functions and setting
options for hot water generation if a domestic hot water
cylinder is connected to the heating installation.
You can set the desired «Hot water circuit» temperature
for the hot water circuit.

5 Operating and display functions
20 Operating instructions VRT 350 0020135485_00
5.2.2 Setting timer programs
5.2.2.1 Showing time periods for one day
06:00 18:0008:00 16:30 22:30
16 °
21 °
Temperature
Time
Desired
night
temperature
Period 1
Desired
day
temperature
20:00
Desired
day
temperature
Period 2
Period 3
Desired
day
temperature
Desired night temperature
Desired
night
temperature
Desired night temperature
Image 5.1: Example: Three time periods in one day
The «Time programmes» function can be used to set the time period for the heating circuit and hot water generation.
If you have not set any time periods, the controller uses the time periods set in the factory settings.